/*
  Controlling a servo position using a potentiometer (variable resistor)
  by Michal Rinott <http://people.interaction-ivrea.it/m.rinott>

  modified on 8 Nov 2013
  by Scott Fitzgerald
  http://www.arduino.cc/en/Tutorial/Knob
*/

#include <Servo.h>

Servo myservo;  // create servo object to control a servo

int potpin = 0;  // analog pin used to connect the potentiometer
int val;    // variable to read the value from the analog pin
int sensor = 2;
int led = 13;

int pirVal = 0;
int state = LOW; 

void setup() {
  Serial.begin(115200);
  Serial.println("Welcome to the Serial Playground!");
  Serial.println("---------------------------------");

  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
  pinMode(sensor, INPUT);
  pinMode(led, OUTPUT);

  while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}

}

void loop() {
  // Serial.print("Counter: ");

  if (Serial.available()) {
     Serial.write(Serial.read());
  }


  val = analogRead(potpin);            // reads the value of the potentiometer (value between 0 and 1023)
  val = map(val, 0, 1023, 0, 180);     // scale it to use it with the servo (value between 0 and 180)
  myservo.write(val);
                    // sets the servo position according to the scaled value
  delay(15);                           // waits for the servo to get there

  // PIR Sensor reading
  pirVal = digitalRead(sensor);   // read sensor value
  if (pirVal == HIGH) {           // check if the sensor is HIGH
    digitalWrite(led, HIGH);   // turn LED ON
    delay(500);                // delay 100 milliseconds

    if (state == LOW) {
      Serial.println("Motion detected!");
      state = HIGH;       // update variable state to HIGH
    }
  }
  else {
    digitalWrite(led, LOW); // turn LED OFF
    delay(500);             // delay 200 milliseconds

    if (state == HIGH) {
      Serial.println("Motion stopped!");
      state = LOW;       // update variable state to LOW
    }
  }
}